Add the equivalent plmtex superscript and subscript tests to the previous plptex tests.
Add the equivalent plmtex superscript and subscript tests to the
previous plptex tests.

Add four specific plmtex tests that mimic the exponents that occur for
badly scaled plbox axes.


svn path=/trunk/; revision=11777

FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot